Diversity of Organisms and Classification

Essential Vocabulary DNA Feeding Prokaryotic: a cell that lacks a nucleus Eukaryotic: a cell that has a nucleus and other complex structures Feeding Autotrophic: an organism that makes it’s own food from solar energy or chemicals Heterotrophic: an organism that must eat other organisms to obtain it’s energy .

Classification of Organisms All organisms can be classified and named according to this system; based on shared traits and a common origin Kingdom Phylum / Division Class Order Family Genus Species King Phillip Came Over For Green Soup

Classification of Bears

Five Kingdom System Bacteria Protists Fungi Plants Animals

Finding Order in Diversity Why Classify? To study the diversity of life To organize and name organisms Why give scientific names? Common names are misleading jellyfish silverfish star fish None of these animals are fish! Go to Section:

Bacteria Kingdom Unicellular, microscopic Motile (Moves) No nucleus Prokaryotic No chlorophyll Decomposers (Saprophytic) Sapro “rotten” Phytic “plants” Parasitic E. Coli: food poisoning (deadly) Normally found in intestines Beneficial Lactobacillus: yogurt and cheese

Protist kingdom Unicellular; microscopic Nucleus present Eukaryotic Autotrophic or heterotrophic Classified by how they move Plant like: Phytoplankton Provide most of worlds oxygen Animal like: Zooplankton Their remains are used in cleansers such as toothpaste and comet

Fungus kingdom Eukaryotic Non-motile (don’t move) No root, stem and leaf No chlorophyll Decomposers Saprophytic or parasitic Reproduce by forming spores Most are multicellular: mushrooms, bread mold etc.. Unicellular: yeasts

Plant Kingdom Eukaryotic Non-motile (don’t move) Most plants contains pigments (chlorophyll) for photosynthesis Autotrophic Can be divided into two groups: Non-flowering plants Flowering plants What about carnivorous plants?

Animal Kingdom Eukaryotic Divided into two groups according to the presence or absence of backbone: Invertebrates : without backbone Sponges, Cnidarians, Flatworms, Round worms, Mollusks, Segmented Worms, Arthropods, Echinoderms, Vertebrates : with backbone Fish, Amphibians, Reptiles, Birds, Mammals

Classification Quest Animals are separated into groups or categories so that they are more easily studied and discussed by scientists and others. Use the following slides to fill in the “Classification Quest” Worksheet

Important Invertebrates: Arthropods Most diverse group of invertebrates Segmented body Hard exoskeleton Several pairs of jointed legs Divided into 3 groups: Crustaceans Arachnids Insects

Diversity Insects Body with 3 segments Crustaceans 6 legs 2 antennae Moths, Butterflies, Bees, Praying Mantis Crustaceans 2 antennae Body with 3 segments 7 or more pairs of legs Gills Aquatic and Land Forms Lobsters, Rollie Pollies, Shrimp Arachnids Body with 2 segments 8 legs Spiders, Scorpions, Ticks

Vertebrate Groups: Fish Amphibians Reptiles Birds Mammals

Fish Cold-blooded Body covered with wet and slimy scales Live in water (Aquatic) Cold-blooded Body covered with wet and slimy scales Streamline body for easy movement through water Fins for balance and to control movement Gills for breathing, must keep moving to breathe External fertilization Most fish lay large numbers of eggs, but some have live birth

Amphibians Cold-blooded Moist, scaleless skin Limbs present Must stay close to water Amphibian means "two lives, (metamorphosis) Limbs present Tetrapods (walk on four legs) Larvae (tadpoles) use gills for breathing; adults use lungs External fertilization Lay eggs in water

Reptiles Cold-blooded Body covered with dry, hard scales Lives on land Breathe with lungs, and sometimes absorb oxygen though their mouth Internal fertilization (mating) Lay shelled eggs ( hard or leathery) Closely related to birds

Birds Warm-blooded With feathers and wings Have bodies and hollow bones that are adapted for flight Beak for feeding Lungs for breathing Internal fertilization ; lay hard shelled eggs Live in almost every habitat on earth

Mammals Warm-blooded Specialized Teeth based on food preferences Single Jaw bone Hair on skin Females have mammary glands for producing milk Lungs for breathing with a diaphragm Internal fertilization Embryos develop inside mothers body

Mammal Subgroups Monotremes Marsupials Placental egg-laying mammals duckbilled platypus, echidna Marsupials pouched mammals short-lived placenta koala, kangaroo, opossum Placental true placenta shrews, bats, whales, humans